Train Braking Control Using On-Board Computer Calculations
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Solution Overview
Problem
Current positive train control systems face limitations in effectively controlling train braking, particularly in determining optimal braking profiles and selecting the most restrictive targets, which can lead to unsafe train movements and accidents.
Innovation Solution
The implementation of an on-board computer system that calculates and displays braking profiles based on brake propagation delay time, brake build-up time, and maximum brake rate, and selects the most restrictive target by evaluating multiple targets to determine the necessary braking velocity and distance, ensuring safe and efficient braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PTC braking control systems are used, then basic braking functions are provided, but the systems cannot accurately determine optimal braking profiles and select the most restrictive targets, leading to unsafe train movements
Solution Approach 1:
The system pre-calculates braking profiles and identifies the most restrictive target before actual braking is needed. The on-board computer determines brake propagation delay time, brake build-up time, and maximum brake rate in advance, and selects the most restrictive target from multiple candidates, allowing the braking system to respond optimally without real-time computation delays
Solution Approach 2:
The braking control system dynamically adjusts braking parameters based on real-time train conditions and target selections. The system generates multiple braking profiles and selects the appropriate one based on the most restrictive target, allowing adaptive response to varying operational conditions while maintaining safety
2Measurement precision
If multiple braking profiles are generated and evaluated, then accurate braking control is achieved, but the computational complexity and processing time increase
Solution Approach 1:
The system pre-generates multiple braking profiles based on predetermined parameters (brake propagation delay time, brake build-up time, maximum brake rate) and pre-identifies the most restrictive target before actual braking decisions are required. This preliminary computation allows rapid selection without real-time calculation delays
Solution Approach 2:
The system replaces complex real-time computational analysis with pre-computed braking profiles and target selection algorithms. By substituting dynamic calculation with predetermined computational models, the system achieves high precision braking control while minimizing processing time
Data Source
AI summary
A method of controlling braking of a train that includes obtaining in an on-board computer of the train a brake propagation delay time (Td), a brake build-up time (T) and a maximum brake rate (αmax) for the train, and controlling braking of the train in the on-board computer by generating one or more braking signals for the train using Td, T and αmax. Also, a methods of determining for a train a profile velocity to a target position of a selected target, selecting a most restrictive target from among a plurality of targets for a train, and determining a plurality of braking parameters for a train having a train consist, wherein the parameters include a brake propagation delay time (Td), a brake build-up time (T) and a maximum brake rate (αmax).